Agilent GC-MS using an HP-5MS column was employed with a temperature programmed at 60 °C in isothermal conditions, and helium gas was used at a 0.5 mL/min rate flow. The MS parameters were: electron energy, 70 eV; ionization, 2 A; temperature, 280 °C; resolution, 1000 scan time, 5 s. The following temperature program was applied: 40 °C to 150 °C, for 8 min and 5 min, respectively, and at a rate of 5 °C/min to 260 °C for 15 min. Compounds were identified by comparing the mass spectra with the spectral libraries NIST and Wiley.
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